The Home Secretary is considering introducing “risk-based” airport boder controls:

The Home Secretary signalled the move during crisis talks with airlines as figures showed that passengers faced queues of up to three hours at Heathrow.

Mrs May said she was ready to consider introducing “risk-based” controls as part of a long-term solution to delays at airports, despite having forced Brodie Clark, the former head of the UK Border Force, out of his job in November after she claimed he had relaxed immigration checks without her authorisation.

More than 500,000 people were allowed into Britain unchecked last year in a breach of defences against terrorists and criminals.